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Pagerank checkers get their data based on the "toolbar pagerank" that is published by Google. When changing your URLs, the data won't show up in the Pagerank checkers until Google updates this data.

Google typically updates this data every three or four months. Unfortunately, the process for updating this data broke at Google and they are not planning to fix it soon. The last Pagerank update was in February 2013 and they don't expect another one until at least sometime in 2014.

Internally, Google is still evaluating inbound links to your site. I have seen no evidence that shows that Google is unable to assign link value to sites internally for ranking purposes.

Having no Pagerank showing is not harming your site in any way. It is just an unfortunate side effect of Google not refreshing the data that they usually provide about Pagerank.